Statement $A$: Convection involves flow of matter within a fluid due to unequal temperatures of its parts.
Statement $B$: $A$ hot bar placed under a running tap water loses heat due to the effect of convection within water.
Statement $C$: Heat transfer always involves a temperature difference between two systems.

  • A
    $A, B, C$ are true
  • B
    Only $A$ and $C$ are true
  • C
    Only $A$ and $B$ are true
  • D
    Only $B$ and $C$ are true

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